I'm looking for advice on Flat Roof systems. I have a closed-in porch off of the side of my house with a flat roof. I'm thinking of using the roof as a deck, b/c it's right off of the master bedroom. The old roof is pretty much shot and I'm looking for a long-lasting option that would keep water out of the main floor and allow me to walk on the roof on a regular basis. I've talked to a couple of roofers and I've been recommended three possible options so far: (i) EPDM heat welded system, (ii) TPO heat welded system and (iii) Duradek's outdoor flooring system. I'm leaning toward the last option based on what I have read so far, but I feel I'm over my head on this one. There seem to be dozens of different choices. Any thoughts?
Oh, I suppose I should mention that this isn't really a "DIY" project; I plan on hiring a professional. So, I don't need advice on how to install any of the options, just on which one to order.